Reidar Finsrud, another very talented mixture of painter, sculptor and inventor claims, that he built a perpetuum mobile sculpture. Of course we do not believe him but the device is really tricky and amazing...

"I have always been drawn to hobbies that spark my curiosity, problem solving, and creativity. For the past several years I have been designing and building small Stirling engines. I was challenged by an engineer to see if it would be possible to design a Stirling engine that would run from the heat of a hand, yet be something that could be built without a machine shop for under $30..."